Categorized | Cisco

How do you Determine the Differences between Cisco’s IOS Image

Our topic today will be of some very important and some unimportant simply because it is created anytime the subject of some thing and will talk about the differences between the versions of IOS in Cisco devices Switch & Router To understand more about what the subject will put some examples on the subject to know more


We all know what that mean but who more  does not know whats means each letter or number .
Our Topic today will be a determining differences between them and what it means each one .
we will divided our subject into two connotations old like our example the first and second and new, as in the third example, and we know information about the Version History used on Cisco devices

use the following command

Cisco IOS
Show Version

The result

Show Version

The first thing you should do is split the name on the following form xxxx-yyyy-zzzz.ssss
And the meaning of each one of which will be as follows:

xxxx = Platform
yyyy = Feature attributes of each version
zzzz = meaning “a place of conservation and whether compressed or not
ssss = version number

As I said, there are two sections of the subject old and new is simply lies in the second part of my Feature only
as we see in the previous examples


as5200 5200
cpa25 CiscoPro 2500
c1005 1005
c2500 25xx, 3xxx, 5100, AP (11.2 and later only)
c2600 2600 Quake platform
c2800 Catalyst 2820
c2900 2910, 2950
c3620 3620
c3640 3640
c4000 4000 (11.2 and later only)
c4500 4500, 4700
c5rsm Catalyst 5000 RSP platform
c5atm Catalyst 4000 ATM platform
c7000 7000, 7010 (11.2 and later only)
c7200 7200
igs IGS, 25xx, 3xxx, 5100, AP
gs7 gateway server (7000, 7010)
mc3810 Ardent Multiservice Cisco 3810 platform
rsp 75xx
xx 4000


a – APPN
a2 – ATM
b – Appletalk
boot – used for boot images
c – Comm-server/Remote Access Server(RAS) subset (SNMP, IP, Bridging, IPX, AT, Decnet, FR, HDLC, PPP, X.25, ARAP, tn3270, PT, XRemote, LAT)
c – Comm-server Lite(CiscoPro)
c2 – Comm-server/Remote Access Server(RAS) subset
d – Desktop subset (SNMP, IP, Bridging, WAN, Remote Node, Terminal Service, IPX, AT, ARAP)
d2 – reduced Desktop subset (SNMP, IP, IPX, AT, ARAP)eboot – ethernet boot image for mc3810 platform
f – FRAD subset (SNMP, FR, PPP, SDLLC, STUN)
f2 – modified FRAD subset (EIGRP, Pcbus, Lan Mgr, removed, OSPF added)
g – ISDN subset (SNMP, IP, Bridging, ISDN, PPP, IPX, AT)
g2 – gatekeeper proxy, voice and video
i – IP subset(SNMP, IP, Bridging, WAN, Remote Node, Terminal Service)
i2 – subset similar to IP subset for system controller image(3600)
i3 – reduced IP subset with BGP/MIB, EGP/MIB, NHRP, DIRRESP removed
j – enterprise subset (formerly bpx, includes protocol translation)
k – kitchen sink (enterprise for high-end)
l – IPeXchange IPX, static routing, gateway
m – RMON (11.1 only)
n – IPX
o – FIrewall (Formerly IPeXchange Net Management)
p2 – Service Provider w/CIP2 ucode
p3 – AS5200 service provider
p4 – 5800(Nitro) service provider
q – Async
q2 – IPeXchange Async
r – IBM base option (SRB, SDLLC, STUN, DLSW, QLLC) – comes with i, in, d
r2 – IBM variant for 1600 images
r3 – IBM variant for Ardent images (3810)
r4 – reduced IBM subset with BSC/MIB, BSTUN/MIB, ASPP/MIB, RSRB/MIB removed
s – source route switch (SNMP, IP, Bridging, SRB) (10.2 and following)
s – (11.2 only) addition to the basic subset (Plus version)
c1600 – (OSPF, IPmulticast, NHRP, NTP, NAT, RSVP, FRSVC)
c2500 – (NAT, RMON, IBM, MMP, VPDN/L2F)
c2600 – (NAT, IBM, MMP, VPDN/L2F, VoIP and ATM)
c3620, 3640 – (NAT, IBM, MMP, VPDN/L2F) in 11.3T added VoIP
c4500 – (NAT, ISL, LANE, IBM, MMP, VPDN/L2F)
c5200 – (PT, v.120, managed modems, RMON, MMP, VPDN/L2F)
c5300 – (MMP, VPDN, NAT, managed modems, RMON, IBM)
c5rsm – (NAT, LANE and VLANS)
c7000 – (ISL, LANE, IBM, MMP, VPDN/L2F)
c7200 – (NAT, ISL, IBM, MMP, VPDN/L2F)
t – (11.2)AIP w/ modified Ucode to connect to Teralink 1000 Data
u – IP with VLAN RIP (Network Layer 3 Switching Software, rsrb, srt, srb, sr/tlb)
v – VIP and dual RSP(HSA) support
w – Reserved for WBU
w2 – Reserved for CiscoAdvantage ED train
w3 – Reserved for Distributed Director
x – X.25 in 11.1 and earlier release
y – reduced IP (SNMP, IP RIP/IGRP/EIGRP, Bridging, ISDN< PPP) (C1003/4)
- reduced IP (SNMP, IP RIP/IGRP/EIGRP, Bridging, WAN – X.25) (C1005)
(11.2 – includes X.25) (C1005)
y – IP variant (no Kerberos, Radius, NTP, OSPF, PIM, SMRP, NHRP…) (C1600)
y2 – IP variant (SNMP, IP RIP/IGRP/EIGRP, WAN – X.25, OSPF, PIM) (C1005)
y2 – IP Plus variant (no Kerberos, Radius, NTP…) (C1600)
y3 – IP/X.31
Y4 – reduced IP variant (Cable, Mibs, DHCP, EZHTTP)
z – managed modems
40 – 40 bit encrytion
56 – 50 bit encryption
56i – 56 bit encryption with IPSEC

Section 3

f – Flash
m – RAM
r – ROM
l – relocatable
z – zip compressed
x – mzip compressed

Section IV Special for Edition number

Indicates the version number and if there are updates or New updates and was added to the same version we will understand more in the example

c2600-ik9o3s3-mz.122-15.T9.bin 122 15 T9

First Section
Tells us that this particular version of the router Series 2600

Section II

Tells us that this version is the IP routing version

Tells us that this version is the 3DES encryption

Tells us that this version supports Firewall / IDS

Tells us that this version is the Basic limited routing

Section III

Meaning that it is working from the RAM

Means that it is Compressed Version

Section V

version 12.2 the number of updates

Number of the new Feature that were added to the basic version

New Feature

as we see there are so many Feature it is difficult to conservation and understanding
but, Cisco relegated to eight Keywords are as follows

IP Base
IP Voice
Enterprise Base
Advanced Security
SP Services
Advanced IP Services
Enterprise Services
Advanced Enterprise Services

Examples :


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